Hello. I am currently struggling with another issue regarding Kotlin MPP. I am unable to successful...

# multiplatform

[Drew]

Hello. I am currently struggling with another issue regarding Kotlin MPP.

I am unable to successfully execute a request using Ktor on iOS. It always throws an InvalidMutabilityException. I have a vague understanding of the mutability aspect, but can't figure out why it's being thrown on Ktor.

From iOS

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen io.ktor.client.request.HttpRequestPipeline@3f59548

I've tried downgrading to Kotlin 1.3.10, as that seemed to be suggested on SO. However, it still throws the same exception.

Kotlin 1.3.11/10
Ktor 1.1.1
Coroutines 1.1.0

[Ashley Figueira]

I had the same issue. Downgrading to kotlin 1.3.10 worked for me. Although i was using Ktor 1.0.1 and Coroutines 1.0.1 also.

[Patrick Jackson]

@Drew did you resolve this? also seeing this with kotlin 1.3.21 ktor 1.1.3 coroutines 1.1.1

[Drew]

@Patrick Jackson I think I did figure it out on my end. I believe it was because my Ktor client was being held in a global object

[Drew]

Aka static, so couldn't be shared/mutated across threads

[Patrick Jackson]

in my case I was not using the mainthread on iOS. I had to switch to using a CoroutineDispatcher that dispatches everything on the main queue.